Evidence for a diradical intermediate in
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G. Huybrechts; B. Van Mele
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Article
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1978
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John Wiley and Sons
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English
⚖ 254 KB
Despite an extensive literature, controversy about the Diels-Alder reaction mechanism still exists. For the thermal dimerization of 1,3-butadiene, for example, a concerted one-step [I] or two-stage [2] mechanism, a mixture of orbital symmetry allowed and forbidden cycloadditions 131, as well as a tw